> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/sel-faq/using-the-software/calculation-modules/beams2/wood-beam/how-is-wood-beam-calculating-f-2.md). # How is Wood Beam determining the Size Factor? How the Wood Beam module determines the Size Factor and how to apply it when manually adjusting member dimensions. ## How is Wood Beam determining the Size Factor? The Size Factor is looked up within a database when a sawn lumber member size is selected. But the program does not have the ability to determine a different Size Factor if the Member Width or Member Depth are adjusted with the spin arrows, or if values are typed into those fields manually. So if you are working with a sawn lumber member size that cannot be selected from the Wood Section Database, best practice is to temporarily select a section size that uses the desired Size Factor, and then manually adjust the section size. The original Size Factor will be used. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.enercalc.com/sel-faq/using-the-software/calculation-modules/beams2/wood-beam/how-is-wood-beam-calculating-f-2.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.